Air pollution and its control 10 Special types of environment. Including soil pollution, air pollution, noise pollution 7 Environmental pollution 6 Environmental health. Including sewage disposal, air pollution, nuisances, water supply 5 Indoor air pollution. Including indoor air quality 5 Environmental effects of industries and plants 3 Fuzzy logic 3 TJ Mechanical engineering and machinery 3 Algorithms 2 Composite materials 2 Environmental auditing 2 Malaysia 2 Mathematical statistics. Probabilities 2 Application software 1 Architecture in relation to special subjects 1 Biodiesel fuels 1 Building fittings and their installation 1 Building inspection 1 Construction equipment in building 1 Economics as a science. Relation to other subjects 1 Enviromental management 1 Environmental engineering 1 Environmental reporting 1 Food service 1 Foodborne diseases 1 Fruit and fruit culture 1 Fruit trees 1 Geographic information systems 1 Hadith literature. Traditions. Sunna 1 Health behavior and habits 1